The TPD is a board with six single pads that are connected to a AT42QT1070 touch sensor. The touch sensor can be connected to any microntroller over TWI. The board itself can be driven with a voltage from 1V8-5V and controlled over the AT42QTXXXX driver library.
| Experience | Level |
|---|---|
| Soldering | |
| Mechanical |
| Type | File | Description |
|---|---|---|
| Schematic | pdf / cadlab | Schematic files |
| Board | pdf / cadlab | Board file |
| Drill | Drill file | |
| BoM | xlsx / html | Bill of Material as Excel/interactive HTML |
| PCB | zip / tar | KiCAD/Gerber/BoM/Drill files |
| Mechanical | zip / tar | FreeCAD/Housing and PCB (STEP/STL) files |
The pcb is created with KiCAD. All files are built with github actions so that they are ready for a production environment.
The circuit board is populated on one side (Bottom). The best way for soldering the SMD components is within a vapor phase soldering system.
The housing has a tolerance of 0.2mm on each side of the case. So the pcb should fit perfectly in the housing. The tolerance can be modified with FreeCAD in the Parameter Spreadsheet.
| Type | Link | Description |
|---|---|---|
| AT42QT1070 | Seven-channel QTouch® Touch Sensor IC |
R. GAECHTER